c5af58b769
This patch adds string optimize codes and some auxiliary codes. Signed-off-by: Chen Linfei <linfei_chen@c-sky.com> Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
84 lines
1.7 KiB
ArmAsm
84 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/linkage.h>
|
|
#include "sysdep.h"
|
|
|
|
.weak memset
|
|
ENTRY(__memset)
|
|
ENTRY(memset)
|
|
/* Test if len less than 4 bytes. */
|
|
mov r12, r0
|
|
cmplti r2, 8
|
|
bt .L_set_by_byte
|
|
|
|
andi r13, r0, 3
|
|
movi r19, 4
|
|
/* Test if dest is not 4 bytes aligned. */
|
|
bnez r13, .L_dest_not_aligned
|
|
/* Hardware can handle unaligned access directly. */
|
|
.L_dest_aligned:
|
|
zextb r3, r1
|
|
lsli r1, 8
|
|
or r1, r3
|
|
lsli r3, r1, 16
|
|
or r3, r1
|
|
|
|
/* If dest is aligned, then copy. */
|
|
zext r18, r2, 31, 4
|
|
/* Test if len less than 16 bytes. */
|
|
bez r18, .L_len_less_16bytes
|
|
|
|
LABLE_ALIGN
|
|
.L_len_larger_16bytes:
|
|
stw r3, (r0, 0)
|
|
stw r3, (r0, 4)
|
|
stw r3, (r0, 8)
|
|
stw r3, (r0, 12)
|
|
PRE_BNEZAD (r18)
|
|
addi r0, 16
|
|
BNEZAD (r18, .L_len_larger_16bytes)
|
|
|
|
.L_len_less_16bytes:
|
|
zext r18, r2, 3, 2
|
|
andi r2, 3
|
|
bez r18, .L_set_by_byte
|
|
.L_len_less_16bytes_loop:
|
|
stw r3, (r0, 0)
|
|
PRE_BNEZAD (r18)
|
|
addi r0, 4
|
|
BNEZAD (r18, .L_len_less_16bytes_loop)
|
|
|
|
/* Test if len less than 4 bytes. */
|
|
.L_set_by_byte:
|
|
zext r18, r2, 2, 0
|
|
bez r18, .L_return
|
|
.L_set_by_byte_loop:
|
|
stb r1, (r0, 0)
|
|
PRE_BNEZAD (r18)
|
|
addi r0, 1
|
|
BNEZAD (r18, .L_set_by_byte_loop)
|
|
|
|
.L_return:
|
|
mov r0, r12
|
|
rts
|
|
|
|
/* If dest is not aligned, just set some bytes makes the dest
|
|
align. */
|
|
|
|
.L_dest_not_aligned:
|
|
sub r13, r19, r13
|
|
sub r2, r13
|
|
.L_dest_not_aligned_loop:
|
|
/* Makes the dest align. */
|
|
stb r1, (r0, 0)
|
|
PRE_BNEZAD (r13)
|
|
addi r0, 1
|
|
BNEZAD (r13, .L_dest_not_aligned_loop)
|
|
cmplti r2, 8
|
|
bt .L_set_by_byte
|
|
/* Check whether the src is aligned. */
|
|
jbr .L_dest_aligned
|
|
ENDPROC(memset)
|
|
ENDPROC(__memset)
|